Legionella Risk Assessments

Legionella Risk Assessments That Find the Real Risks—Before an Incident Forces Your Hand

Legionella doesn’t require a “dirty” building to become a threat. It needs the right conditions: warm water, stagnation, biofilm/scale, and places that create aerosols. If your building has complex plumbing, intermittent use, or aerosol-producing equipment, you can have high-risk zones without realizing it. A Legionella Risk Assessment identifies where Legionella is most likely to grow and spread—then gives you a prioritized plan to fix it.

The Problem: Legionella Risk Lives in the Blind Spots

Most facilities don’t struggle because they’re doing nothing. They struggle because risk is hiding in the details

If you can’t clearly point to your highest-risk locations and what controls protect them, you’re exposed.

Warm water temps drifting into the “growth-friendly” range 

Low-flow outlets and dead legs creating stagnation 

Biofilm/scale protecting bacteria from disinfectants 

Equipment that aerosolizes water (cooling towers, showers, decorative features) 

Documentation that doesn’t match real-world operations 

Legionella is the most common cause of illness outbreaks linked to drinking water in the U.S.

That’s why water risk programs and risk management planning have become a major focus for large buildings and high-risk facilities. 

A Clear Map of Risk + A Practical Plan

System Review

We evaluate your water system design and how it’s actually used—especially areas where conditions trend toward warm, stagnant, or under-treated water. 

On-Site Inspection

We identify risk conditions such as stagnation points, temperature challenges, biofilm/scale indicators, and aerosol sources. We rank findings based on likelihood and consequence—so you’re not stuck with a long list and no direction. 

Action Plan

We outline practical steps to reduce risk, which may include operational changes, cleaning/maintenance improvements, control targets, and disinfection recommendations.

Next-Step Support

If you want to move forward, we can help implement controls, build/update your Water Management Plan, and coordinate validation testing. 

ChemREADY’s Legionella Risk Assessment is designed to answer three questions: 

Where could Legionella grow? 

Where could exposure happen? 

What should we fix first to reduce risk fastest? 

You’ll receive clear findings and prioritized recommendations that your team can act on.

What We Evaluate

A Legionella risk assessment typically considers factors such as: 

How it Works

Temperature & Flow Insights

We assess conditions that support Legionella growth, including water temperature patterns and areas with stagnation or low flow.

We identify where scale, corrosion, or biofilm may develop—factors that can shield Legionella and reduce disinfectant effectiveness.

We review points in your system where disinfectant residuals are difficult to maintain and where system complexity may increase risk.

We evaluate aerosol-generating devices and consider who is most at risk based on building occupancy, health vulnerability, and use patterns.

Where Risk Assessments Are Most Common

Legionella risk assessments are especially valuable for: 

  • Healthcare & senior living environments 
  • Hospitality (hotels, pools, spas) 
  • Large commercial buildings 
  • Industrial facilities with complex water systems 
  • Any facility with cooling towers, domestic hot water loops, or aerosolizing fixtures 

NSF Certified Chemicals

Our formulations meet NSF safety standards to protect your people and your equipment.

50+ Years of Expertise

Backed by decades of industry experience and a proven track record of results.

Regional Expertise

Serving facilities across the midwest with responsive, local water treatment support.

Get a Legionella Risk Assessment

If you already have a Water Management Plan, we’ll review it and tell you what’s missing, unclear, or risky—and what to fix first.

Our Services

Closed Loop Water Treatment

Closed loops feed your heat exchangers too. Explore our Closed Loop Water Treatment and Glycol Solutions to stop corrosion before it reaches your boiler.

Cooling Tower Solutions

Your steam system isn’t the only one that needs protection. Keep your cooling water clean and balanced with our Cooling Tower Treatment Programs.

Filtration Solutions

For maximum reliability, combine your boiler program with Filtration Solutions to remove rust and debris before they enter your feedwater system

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